The 2010-2011 Canterbury, New Zealand, seismic sequence: Multiple source analysis from InSAR data and modeling

[1] The 2010–2011 Canterbury sequence is a complex system of seismic events that started with a Mw7.1 earthquake and continued with large aftershocks with dramatic consequences, particularly for the city of Christchurch. We model the main earthquakes using InSAR data, providing displacement maps and the respective modeling for the September 4th, 2010, February 22nd, 2011 and June 13th, 2011 events. Relocated aftershocks, field and GPS surveys are used to constrain models obtained by inversion of InSAR data; the fault slip distribution is retrieved with a variable patch size approach aimed at maximizing the spatial resolution on the fault plane. For the September 2010 earthquake we estimated significant slip values below 10 km depth; the calamitous February 2011 event in Christchurch is modeled with a double fault source with slip values less than 2 m down to 7 km depth; for the second June 13th event in Christchurch we identified a NW-SE striking fault as responsible for the earthquake. Last, we introduce the use of InSAR coherence maps to quickly detect the areas subject to soil liquefaction in Christchurch, as shown for the two main events.

[1]  John Ristau,et al.  Implementation of Routine Regional Moment Tensor Analysis in New Zealand , 2008 .

[2]  James Jackson,et al.  Slip in the 2010–2011 Canterbury earthquakes, New Zealand , 2012 .

[3]  M. Mucciarelli.  Ambient Noise Measurements following the 2011 Christchurch Earthquake: Relationships with Previous Microzonation Studies, Liquefaction, and Nonlinearity , 2011 .

[4]  Eric J. Fielding,et al.  Fault Location and Slip Distribution of the 22 February 2011 Mw 6.2 Christchurch, New Zealand, Earthquake from Geodetic Data , 2011 .

[5]  Andrea Antonioli,et al.  Optimal fault resolution in geodetic inversion of coseismic data , 2011 .

[6]  Christian Bignami,et al.  Finite fault inversion of DInSAR coseismic displacement of the 2009 L'Aquila earthquake (central Italy) , 2009 .

[7]  Brendon A. Bradley,et al.  Soil Liquefaction Effects in the Central Business District during the February 2011 Christchurch Earthquake , 2011 .

[8]  K. Feigl,et al.  The displacement field of the Landers earthquake mapped by radar interferometry , 1993, Nature.

[9]  Caroline Holden,et al.  The Darfield (Canterbury) earthquake of September 2010 , 2010 .

[10]  Marcello de Michele,et al.  Assessing Ionospheric Influence on L-Band SAR Data: Implications on Coseismic Displacement Measurements of the 2008 Sichuan Earthquake , 2010, IEEE Geoscience and Remote Sensing Letters.

[11]  P. Adler,et al.  Fluid flow triggered migration of events in the 1989 Dobi Earthquake sequence of central Afar , 1997 .

[12]  W. Brown.  Synthetic Aperture Radar , 1967, IEEE Transactions on Aerospace and Electronic Systems.

[13]  SURFACE RUPTURE OF THE GREENDALE FAULT DURING THE DARFIELD (CANTERBURY) EARTHQUAKE, NEW ZEALAND: INITIAL FINDINGS , 2010 .

[14]  S. Cox,et al.  Regional Geological Framework of South Island, New Zealand, and its Significance for Understanding the Active Plate Boundary , 2013 .

[15]  Christian Bignami,et al.  Did the September 2010 (Darfield) earthquake trigger the February 2011 (Christchurch) event? , 2011, Scientific reports.

[16]  Hiroaki Iizuka,et al.  Strong Ground Motions and Damage Conditions Associated with Seismic Stations in the February 2011 Christchurch, New Zealand, Earthquake , 2011 .

[17]  Ian Joughin,et al.  Ice-sheet velocity mapping: a combined interferometric and speckle-tracking approach , 2002, Annals of Glaciology.

[18]  Fine-scale Relocation of Aftershocks of the 22 February Mw 6.2 Christchurch Earthquake using Double-difference Tomography , 2011 .

[19]  Michael Eineder,et al.  Accuracy of differential shift estimation by correlation and split-bandwidth interferometry for wideband and delta-k SAR systems , 2005, IEEE Geoscience and Remote Sensing Letters.

[20]  W. Menke.  Geophysical data analysis : discrete inverse theory , 1984 .

[21]  Roberto Paolucci,et al.  Numerical Study on the Role of Basin Geometry and Kinematic Seismic Source in 3D Ground Motion Simulation of the 22 February 2011 Mw 6.2 Christchurch Earthquake , 2011 .

[22]  Karim E. Mattar,et al.  Influence of ionospheric electron density fluctuations on satellite radar interferometry , 2000 .

[23]  Pilar Villamor,et al.  Surface rupture during the 2010 Mw 7.1 Darfield (Canterbury) earthquake: Implications for fault rupture dynamics and seismic-hazard analysis , 2012 .

[24]  J. Beavan,et al.  Balancing the plate motion budget in the South Island, New Zealand using GPS, geological and seismological data , 2007 .

[25]  Y. Okada.  Surface deformation due to shear and tensile faults in a half-space , 1985 .

[26]  Richard H. Sibson,et al.  Stress Control of an Evolving Strike-Slip Fault System during the 2010–2011 Canterbury, New Zealand, Earthquake Sequence , 2011 .

[27]  Caroline Holden,et al.  THE DARFIELD (CANTERBURY) EARTHQUAKE OF SEPTEMBER 2010: PRELIMINARY SEISMOLOGICAL REPORT , 2010 .

[28]  L. Chiaraluce,et al.  Fluid flow and seismicity pattern: Evidence from the 1997 Umbria‐Marche (central Italy) seismic sequence , 2005 .

[29]  K. Jezek,et al.  Velocities and Flux of the Filchner Ice Shelf and its Tributaries Determined from Speckle Tracking Interferometry , 2001 .

[30]  Urs Wegmüller,et al.  Glacier motion estimation using SAR offset-tracking procedures , 2002, IEEE Trans. Geosci. Remote. Sens..

[31]  C. Holden.  Kinematic Source Model of the 22 February 2011 Mw 6.2 Christchurch Earthquake Using Strong Motion Data , 2011 .

[32]  Ruth A. Harris,et al.  Introduction to Special Section: Stress Triggers, Stress Shadows, and Implications for Seismic Hazard , 1998 .

[33]  Tazio Strozzi,et al.  Glacier surge dynamics of Sortebræ, east Greenland, from synthetic aperture radar feature tracking , 2005 .

[34]  Bill Fry,et al.  The Character of Accelerations in the Mw 6.2 Christchurch Earthquake , 2011 .

[35]  Rowena B. Lohman,et al.  InSAR and Optical Constraints on Fault Slip during the 2010–2011 New Zealand Earthquake Sequence , 2011 .

[36]  Misko Cubrinovski,et al.  Comparison of liquefaction Features observed during the 2010 and 2011 Canterbury earthquakes , 2011 .

[37]  B. Bradley,et al.  Use of DCP and SASW Tests to Evaluate Liquefaction Potential: Predictions vs. Observations during the Recent New Zealand Earthquakes , 2011 .

[38]  Sergey V. Samsonov,et al.  THE DARFIELD (CANTERBURY) EARTHQUAKE: GEODETIC OBSERVATIONS AND PRELIMINARY SOURCE MODEL , 2010 .

[39]  John P. Merryman Boncori,et al.  An Error Prediction Framework for Interferometric SAR Data , 2008, IEEE Transactions on Geoscience and Remote Sensing.

[40]  Kelvin Berryman,et al.  A New Seismic Hazard Model for New Zealand , 2002 .

[41]  John P. Merryman Boncori,et al.  A Tunable Closed-Form Model for the Structure Function of Tropospheric Delay , 2008, IEEE Geoscience and Remote Sensing Letters.

[42]  Z. Zhan,et al.  Coulomb Stress Change Sensitivity due to Variability in Mainshock Source Models and Receiving Fault Parameters: A Case Study of the 2010–2011 Christchurch, New Zealand, Earthquakes , 2011 .

[43]  Adrian J. Luckman,et al.  Improvement of Satellite Radar Feature Tracking for Ice Velocity Derivation by Spatial Frequency Filtering , 2007, IEEE Transactions on Geoscience and Remote Sensing.

[44]  Finite element modelling of topographic effects on elastic ground deformation at Mt. Etna , 2005 .